#include<iostream>
#include<cstdlib>
#include"cstring.h"

using namespace std;

int main()
{
	CString st1("mayank"); // this can be changed
	int l;
	l=st1.substr("ay");
	if(l>0)
	{
		cout<<"\n substring present \n";
	}
	else
	{
		cout<<"\n not present \n";
	}
	
	return 0;
}
